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On the propagation characteristics of tunnel surface-waves for seismic prediction

Jetschny, Stefan; Bohlen, Thomas; De Nil, Denise

To increase the safety and efficiency of tunnel constructions, online seismic exploration ahead of a tunnel has become a valuable tool. One recent successful forward looking approach is based on the excitation and registration of tunnel surface- aves. For further development and for finding optimal acquisition geometries it is important to study the propagation characteristics of tunnel surface-waves. 3D seismic finite difference modelling and analytic solutions of the wave equation in cylindrical coordinates reveal that at higher frequencies, i.e., if the tunnel-diameter is significantly larger than the wavelength of surface-waves, these surface-waves can be regarded as Rayleigh-waves confined to the tunnel wall and following helical paths along the tunnel axis. For lower frequencies, i.e., when the tunnel surface-wavelength approaches the tunnel-diameter, the propagation characteristics of these surface-waves are similar to S-waves. We define the surface-wave wavelength-to-tunnel diameter ratio w to be a gauge for separating Rayleigh- from S-wave excitation. For w > 1.2 tunnel surface-waves behave like S-waves, i.e. their veloc ... mehr

DOI: 10.1111/j.1365-2478.2009.00823.x
Zitationen: 17
Web of Science
Zitationen: 11
Zugehörige Institution(en) am KIT Geophysikalisches Institut (GPI)
Publikationstyp Zeitschriftenaufsatz
Jahr 2010
Sprache Englisch
Identifikator ISSN: 0016-8025
KITopen-ID: 1000028839
Erschienen in Geophysical Prospecting
Band 58
Heft 2
Seiten 245-256
Nachgewiesen in Web of Science
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